Overview
- A peer‑reviewed lifecycle analysis published in Science concludes that replacing a working gasoline car with a battery electric vehicle yields large lifetime greenhouse‑gas reductions even when the gas car is relatively new.
- The authors used conservative assumptions that favored gasoline cars by treating existing ICE manufacturing emissions as sunk, yet still found about a 50% lifetime emissions cut when swapping a two‑year‑old car for an EV.
- The study gives concrete mileage 'repayment' thresholds for the extra carbon from EV manufacture: roughly 4,400 miles for a car and about 6,700 miles driven per year for a truck.
- Benefits vary by region and use because grid mix and annual mileage matter most; clean grids (for example, hydro‑heavy upstate New York) make EVs far cleaner while fossil‑heavy grids still favor EVs over nearly all gasoline models.
- Authors and analysts say the results support targeted policies such as scrappage‑and‑replacement programs or measures to curb initial gasoline car sales, while noting gaps on consumer costs and full oil‑supply emissions that need more study.